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{
TP Lex message and error handling module
Note: this module should be USEd by any module using the heap during
initialization, since it installs a heap error handler (which
terminates the program with fatal error `memory overflow').
Copyright (c) 1990-92 Albert Graef <ag@muwiinfa.geschichte.uni-mainz.de>
Copyright (C) 1996 Berend de Boer <berend@pobox.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Revision: 1.3 $
$Modtime: 96-08-01 8:52 $
$History: LEXMSGS.PAS $
*
* ***************** Version 2 *****************
* User: Berend Date: 96-10-10 Time: 21:16
* Updated in $/Lex and Yacc/tply
* Updated for protected mode, windows and Delphi 1.X and 2.X.
}
unit LexMsgs;
interface
var errors, warnings : Integer;
(* - current error and warning count *)
procedure error(msg : String; pos : Integer);
(* - print current input line and error message (pos denotes position to
mark in source file line) *)
procedure warning(msg : String; pos : Integer);
(* - print warning message *)
procedure fatal(msg : String);
(* - writes a fatal error message, erases Lex output file and terminates
the program with errorlevel 1 *)
const
(* sign-on and usage message: *)
sign_on = 'TP Lex Version 4.1a [April 2000], Copyright (c) 1990-2000 Albert Graef';
{$ifdef Unix}
usage = 'Usage: plex [options] lex-file[.l] [output-file[.pas]]';
{$else}
usage = 'Usage: lex [options] lex-file[.l] [output-file[.pas]]';
{$endif}
options = 'Options: -v verbose, -o optimize';
(* command line error messages: *)
invalid_option = 'invalid option ';
illegal_no_args = 'illegal number of parameters';
(* syntax errors: *)
unmatched_lbrace = '101: unmatched %{';
syntax_error = '102: syntax error';
unexpected_eof = '103: unexpected end of file';
(* semantic errors: *)
symbol_already_defined = '201: symbol already defined';
undefined_symbol = '202: undefined symbol';
invalid_charnum = '203: invalid character number';
empty_grammar = '204: empty grammar?';
(* fatal errors: *)
cannot_open_file = 'FATAL: cannot open file ';
write_error = 'FATAL: write error';
mem_overflow = 'FATAL: memory overflow';
intset_overflow = 'FATAL: integer set overflow';
sym_table_overflow = 'FATAL: symbol table overflow';
pos_table_overflow = 'FATAL: position table overflow';
state_table_overflow = 'FATAL: state table overflow';
trans_table_overflow = 'FATAL: transition table overflow';
macro_stack_overflow = 'FATAL: macro stack overflow';
implementation
uses LexBase;
procedure position(var f : Text;
lineNo : integer;
line : String;
pos : integer);
(* writes a position mark of the form
gfilename (lineno): line
^
on f with the caret ^ positioned at pos in line
a subsequent write starts at the next line, indented with tab *)
var
line1, line2 : String;
begin
(* this hack handles tab characters in line: *)
line1 := intStr(lineNo)+': '+line;
line2 := blankStr(intStr(lineNo)+': '+copy(line, 1, pos-1));
writeln(f, line1);
writeln(f, line2, '^');
write(f, tab)
end(*position*);
procedure error(msg : String; pos : Integer);
begin
inc(errors);
writeln;
position(output, lno, line, pos);
writeln(msg);
writeln(yylst);
position(yylst, lno, line, pos);
writeln(yylst, msg);
if ioresult<>0 then ;
end(*error*);
procedure warning(msg : String; pos : Integer);
begin
inc(warnings);
writeln;
position(output, lno, line, pos);
writeln(msg);
writeln(yylst);
position(yylst, lno, line, pos);
writeln(yylst, msg);
if ioresult<>0 then ;
end(*warning*);
procedure fatal(msg : String);
begin
writeln;
writeln(msg);
close(yyin); close(yyout); close(yylst); erase(yyout);
halt(1)
end(*fatal*);
{$ifndef fpc}
{$IFNDEF Win32}
function heapErrorHandler ( size : Word ): Integer; far;
begin
if size>0 then
fatal(mem_overflow) (* never returns *)
else
heapErrorHandler := 1
end(*heapErrorHandler*);
{$ENDIF}
{$endif}
begin
errors := 0; warnings := 0;
{$ifndef fpc}
{$IFNDEF Win32}
(* install heap error handler: *)
heapError := @heapErrorHandler;
{$ENDIF}
{$endif}
end(*LexMsgs*).
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